**Getting Closer **
If you stand tall and suddenly move in so close to a trout that you loom into its view, it's gone. How close is too close? The angle of light refraction off the surface dictates a simple formula for how low you must be to stay beneath a trout's line of sight. At 40 feet, unless you play for the NBA, you can stand upright and the trout's line of sight will pass over your head. At 30 feet, you need to bend over. At 20 feet, you'd best be on your knees. At 10 feet, you'll either be crawling or else eyeball-to-eyeball with a trout you have little chance to catch.